REV. 0
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a
AD6190
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 1998
900 MHz RF Transceiver
FUNCTIONAL BLOCK DIAGRAM
/2
10.7
Z87L00
SPREAD-
SPECTRUM
CONTROLLER
T/R
S/W
ANT
FILTER
POWER
MANAGEMENT
AND
CONTROL
VOLTAGE
REGULATOR
0
90
PA
0
90
64/65
10.7 10.7
15MHz SYNTHESIZER
VREG
VBATT
LIMOUT
RSSI
TXON
RXON
VCOON
VREG
AD6190
IQ
VCO
FEATURES
Complete 900 MHz RF Transceiver
LNA
Receive Mixer
Transmit Mixer
Driver Amplifier
VCO
Prescaler
Limiter Amplifier with RSSI
On-Chip Low Dropout Regulator
Independent Sleep Modes for TX, RX
28-Lead SSOP Package
APPLICATIONS
902 MHz–928 MHz ISM Band Cordless Telephones
902 MHz–928 MHz ISM Band Wireless Data Systems
GENERAL DESCRIPTION
The AD6190 900 MHz RF Transceiver provides a complete
RF/IF section for systems operating in the 902 MHz–928 MHz
license-free ISM band. The high level of integration allows several
dozen discrete components to be replaced. It is ideally suited
for use in cordless telephone and wireless data applications.
The receiver section includes a Low Noise Amplifier (LNA).
The LNA’s output drives an image-reject mixer; the mixer’s
output optimized for 10.7 MHz is filtered and processed by the
limiting IF amplifier.
The transmit section accepts a modulated 10.7 MHz IF input,
and uses an image-reject upconverter to mix the signal up to the
902 MHz–928 MHz RF carrier frequency while suppressing the
unwanted image and LO components. The RF output is raised
to a nominal 0.5 milliwatt (–3 dBm) output level. This output
can be used directly or can drive an external power amplifier to
higher levels.
The on-chip VCO operates at 2× the local oscillator frequency.
This reduces oscillator pulling due to strong interferers in-band
or transmitter leakage. An on-chip 64/65 prescaler allows the
VCO to be controlled by a low cost 15 MHz CMOS synthesizer.
An on-chip low dropout regulator minimizes VCO pushing. The
transmit section, receive section, or both, can be placed in a low
current SLEEP mode when not in use. The AD6190 900 MHz
RF transceiver is packaged in a 28-lead SSOP package.
The AD6190 900 MHz RF Transceiver is part of the Analog
Devices/Zilog “A-to-Z Phone” Spread-Spectrum System for
cordless telephone and data communications applications. Con-
tact Zilog directly at (408) 370-8000 for more information on
the Z87000 series baseband controller chips.